App窗口创建流程（Android12 ）

有关的窗口对象

PhoneWindow	ActivityThread#performLaunchActivity {Activity.attach}
Surface	new ViewRootImpl 创建null对象 mSurface.transferFrom(getOrCreateBLASTSurface())//填充内容 创建native层的Surface
Layer	SurfaceFlinger::createLayer
RenderSurface	SurfaceFlinger gpu合成layer之后的数据管理类
FramebufferSurface	Framebuffer管理类，负责消费合成的layer数据，送显
SurfaceControl	ViewRootImpl#relayoutWindow{mSurface.copyFrom(mSurfaceControl)}  //改变Surface buffer属性
IWindowSession	new ViewRootImpl(contexst, display, WindowManagerGlobal.getWindowSession())
WindowManagerGlobal	ActivityThread#handleLaunchActivity  {WindowManagerGlobal.initialize()}

App窗口完整创建流程

Launcher#startActivity() -> SystemServer -> zygote newProcess

->App #newActivityThread.main() ->ActivityThread#handleLaunchActivity

-> ActivityThread.performLaunchActivity

{

       WindowManagerGlobal.initialize()

       newActivity().attach(context)

}

->ActivityThread#handleResumeActivity->wm.addView(decor

->WindowManagerGlobal.addView(WindowManagerGlobal.setView

{
      new ViewRootImpl()#setView  ->  requestlayout ->  performTraversals  ->  relayoutWindow()

mWindowSession.relayout(mSurfaceControl -> wms.relayout 开始创建SurfaceControl和Layer

}

创建SurfaceControl过程：

• mWindowSession.relayout(mSurfaceControl
• -> wms.createSurfaceControl()
• ->mSurfaceControl = WindowStateAnimator.createSurfaceLocked//开始创建Surface
• ->mSurface.copyFrom(mSurfaceControl) //把mSurfaceControl复制到ViewRootImpl对象的mSurface里面后续操作window使用

从wms.createSurfaceLocked ~ SurfaceFlinger::createLayer 如图所示

Surface创建流程见App申请Surface流程（Android12 ）-CSDN博客

部分资料参考于：Android14 SurfaceFlinger Surface的创建_pendingbuffercounter-CSDN博客